People keep using Oracle because they have a ton of code and migration would be too costly.
Oracle is not imune to software issues. In fact, this year I lost two weekends because of a buggy upgrade on the cloud that left my production cluster in a failed state.
It doesn't do me any good. All I can get from Oracle is the possibility of opening a support ticket and then having to send them tons of log files. If I use max severity, they expect me to be available 24/7, any other severity means they'll take weeks to look at it.
Most times I prefer to wade through the knowledge base until I find a solution.
Oracle is not imune to software issues. In fact, this year I lost two weekends because of a buggy upgrade on the cloud that left my production cluster in a failed state.